[Gate-users] A couple of contributions

[Jose L. Rubio]

Hello everybody,

This email is just to make available to the GATE community a couple of 
modifications that our group has developed as part of our simulations 
with GATE, and  that we consider could be useful for other GATE users.

For each of them, we attach patches valid for GATE v3.0.0 and v3.1.2, 
which can be applied like this:

  cd /path/to/your/gate/source/
  patch -p1 < /path/to/the/patch/gate-v3.1.2-FreeAngularRepeater.patch

and then rebuild GATE.


The first contribution is called 'FreeAngularRepeater'  (a modification of
GATE's ring repeater) and allows for free positioning of the angular
replicas instead of equal-spaced replicas in GATE's ring repeater. 
As an example, the code for repeating a volume at angular positions 
0º, 15º, 60º and 75º around Z axis would be the following:

   /gate/object/repeaters/name FreeAngularRepeater
   /gate/object/repeaters/insert angle
   /gate/object/FreeAngularRepeater/setang 0   deg
   /gate/object/FreeAngularRepeater/setang 15 deg
   /gate/object/FreeAngularRepeater/setang 60 deg
   /gate/object/FreeAngularRepeater/setang 75 deg

A list of currently set angles is shown by executing
  /gate/object/FreeAngularRepeater/describe

And it can be reset with:
  /gate/object/FreeAngularRepeater/resetAng
  


As for the second contribution, it implements the opposite of the 
'Confine' option available for GATE sources. That is, it allows 
to define cold regions inside activity sources, which can be 
useful for instance for simulating a Cold Derenzo phantom.
The sintaxis is similar to the 'Confine' option, but using 'Forbid' 
instead. For instance the following code:
 
  ...
  /gate/world/daughters/name bigCylinder
  /gate/world/daughters/insert cylinder
  /gate/bigCylinder/geometry/setRmax 40 mm
  /gate/bigCylinder/geometry/setHeight 40 mm
 
  /gate/bigCylinder/daughters/name smallCylinder
  /gate/bigCylinder/daughters/insert cylinder
  /gate/smallCylinder/geometry/setRmax 20 mm
  /gate/smallCylinder/geometry/setHeight 20 mm
  ...
  /run/initialize
  ...
  /gate/source/addSource mySource
  /gate/source/mySource/gps/type Volume
  /gate/source/mySource/gps/shape Cylinder
  /gate/source/mySource/gps/radius 40 mm
  /gate/source/mySource/gps/halfz 20. mm
  /gate/source/mySource/gps/Forbid smallCylinder

defines an activity source in the 40x40 cylinder 'bigCylinder' volume, 
excluding the 'smallCylinder' sub-volume, in which no activity at all will be generated.


We hope you find it useful, if you have questions about its usage, feel 
free to send an email either to jlrubio at die.upm.es  or  
aurora.gonzalez at die.upm.es .

Best regards,
Jose & Aurora





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